Since April of 2008, the LEGO building community has been gripped by the concept of Cave Racers. Small, fast vehicles that add excitement to the Star Wars "Pod Racer" concept by getting rid of the pod and hanging the driver directly off of the back of the engine.

The innovator behind the theme, Tim "Gambort" Gould has teamed up with Reasonably Clever to develop a sub-theme of Cave Racers where LEGO Animals are the pilots. We call 'em "Pigs on the Wing" (or PoW) after the classic Pink Floyd tracks. (Yes, kids, there was quality music prior to Hannah Montana. Trust us on this.)

The PoW starts with the Classic Cave Racer design elements. (If you don't know what those are, check out this page.) Then, a few changes and modifications are made.
Here are the Official Pigs on the Wing Design Elements and Rules:

A Spear (actual part is flexible so long as it's flattish and long. But you really should just use a spear.)

The pilot must be a LEGO animal

Brickforge and other custom built animals are allowed

Megablok and competing major brands, however, are not allowed.

When wondering if a particular item counts as a LEGO animal, ask yourself "Does this figure look like a human wearing a costume"? If the answer is "yes", then odds are you're going to lose some points. If the item looks like the animal as you'd see it at the zoo, you're fine.

Monkeys are allowed, but be warned: The judges consider their use "too easy" so your build will have to be pretty spectacular to impress them! (Monkeys must be mounted as a "traditional" cave racer - they hang from a pair of handlebars by their front limbs.)

The pilot must hang from the rear of the craft

In the case of animals with only 1 connection point on the bottom (frogs, owls, small cats, etc.) if they are mounted, they must be mounted on a 3900 Paddle/Signal Holder

In the case of larger animals, the animal cannot be attached by the legs. How they DO hang on is left as an exercise for the builder. (The octopus figure is excepted from this rule). See this entry for an example of a classy way to suspend a larger animal.

The challenge here is to build your own PoW - and enter it into one of three categories:

Class One:BasicPoW

Build a PoW following the design requirements stated above

Class Two:DUPLOPoW

A slightly tougher challenge, build a PoWwith a DULPO animal as the pilot - and using as much DUPLO in the racer construction as possible.